I need help with these questions.

1. b=6

2.b=8

3.a=30

I can't get the correct answer for 4 and 5 hope what I've got so far helps.

Step-by-step explanation:

1. 8^2+b2=10^2

64+b2=100

b2=36

then square to get

b=6

2. 15^2+b2=17^2

225+b2=289

b2=64

then square to get

b=8

3.  a2+40^2=50^2

a2+1600=2500

a2=900

then square to get

a=30

I can't get the correct answer for 4 and 5 hope what I've got so far helps.

the first dot plot best represents the data

plzplzplzplz mark brainliest and have a good day